[ 278 ] 

 fmall overfhot ftream. This wheel works 

 three pair of grinding ftones for corn, a 

 boulting mill, which difcharges the meal 

 divided into three forts of flour, befides 

 the feparation of the pollard and bran ; 

 and thefe works are effedled with hogs 

 briftles, fixed within the wire fieves. It 

 ]ikewife turns a machine for making mor- 

 tar, which is done by being laid upon a 

 horizontal flone, worked by a cogged wheel 

 beneath it ; and the horizontal ftone turns 

 two others that are fixed obliquely, and 

 work by their fridion the mortar under 

 them, which is taken off as made, by a 

 man who is ready for the purpofe. 



This little ftream further turns another 

 machine, of excellent ufe : It is for fifting 

 the fand ufed in the buildings, and wafh- 

 ing out the little ftones that are in it; 

 v/hich it performs very effedually and ex- 

 pedLtioully. The fketch, Plate VIII. Fig. 2, 

 will explain the mechanifm. 



a. Is the tube from which the water ifTues. 



b. The hopper, in which the fand is 



thrown out of wheel-barrows. 



c. Is a wier cylindrical fieve, into which 



the fand nlis from the hopper, and 

 which, being turned by the large 



wheel, 



